Jonathan and Cody's older brother Josh, who is pictured in the Figure below, is standing at the
top of a half-pipe at Newton's Skate Park. Gravity is
exerting a downward force on the skateboard, as
seen in the picture. Why doesn't it tip over the edge
and start rolling down the side of the half-pipe?

Write the correct abbreviation for each metric unit

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

An open cart is moving along a straight frictionless horizontal track. when rain starts falling vertically into the cart, what happens to the speed of the cart?